You're driving along and you see a pair of flashing blue lights in your rearview mirror. Whether or not you've done anything wrong, you get a sinking feeling in your stomach.

You've read enough news stories, seen enough headlines, and lived in the American police state long enough to be anxious about any encounter with a cop that takes place on the side of the road.

For better or worse, from the moment you're pulled over, you're at the mercy of law enforcement officers who have almost absolute discretion to decide who is a threat, what constitutes resistance, and how harshly they can deal with the citizens they were appointed to "serve and protect."